1 /* sane - Scanner Access Now Easy.
2 Copyright (C) 2006 Tower Technologies
3 Author: Alessandro Zummo <a.zummo@towertech.it>
4 This file is part of the SANE package.
5
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <https://www.gnu.org/licenses/>.
18
19 As a special exception, the authors of SANE give permission for
20 additional uses of the libraries contained in this release of SANE.
21
22 The exception is that, if you link a SANE library with other files
23 to produce an executable, this does not by itself cause the
24 resulting executable to be covered by the GNU General Public
25 License. Your use of that executable is in no way restricted on
26 account of linking the SANE library code into it.
27
28 This exception does not, however, invalidate any other reasons why
29 the executable file might be covered by the GNU General Public
30 License.
31
32 If you submit changes to SANE to the maintainers to be included in
33 a subsequent release, you agree by submitting the changes that
34 those changes may be distributed with this exception intact.
35
36 If you write modifications of your own for SANE, it is your choice
37 whether to permit this exception to apply to your modifications.
38 If you do not wish that, delete this exception notice. */
39
40 #include "../include/sane/config.h"
41
42 #include <errno.h>
43 #include <unistd.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <limits.h>
47
48 #ifndef SSIZE_MAX
49 #define SSIZE_MAX LONG_MAX
50 #endif
51
52 #ifdef HAVE_WINSOCK2_H
53 #include <winsock2.h>
54 #endif
55 #ifdef HAVE_SYS_SOCKET_H
56 #include <sys/socket.h>
57 #endif
58
59 #define BACKEND_NAME sanei_tcp
60
61 #include "../include/sane/sane.h"
62 #include "../include/sane/sanei_debug.h"
63 #include "../include/sane/sanei_tcp.h"
64
65 SANE_Status
sanei_tcp_open(const char * host,int port,int * fdp)66 sanei_tcp_open(const char *host, int port, int *fdp)
67 {
68 int fd, err;
69 struct sockaddr_in saddr;
70 struct hostent *h;
71 #ifdef HAVE_WINSOCK2_H
72 WSADATA wsaData;
73 #endif
74
75 DBG_INIT();
76 DBG(1, "%s: host = %s, port = %d\n", __func__, host, port);
77
78 #ifdef HAVE_WINSOCK2_H
79 err = WSAStartup(MAKEWORD(2, 2), &wsaData);
80 if (err != 0)
81 return SANE_STATUS_INVAL;
82 #endif
83
84 h = gethostbyname(host);
85
86 if (h == NULL || h->h_addr_list[0] == NULL
87 || h->h_addrtype != AF_INET)
88 return SANE_STATUS_INVAL;
89
90 if ((fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
91 return SANE_STATUS_INVAL;
92
93 memset(&saddr, 0x00, sizeof(struct sockaddr_in));
94
95 saddr.sin_family = AF_INET;
96 saddr.sin_port = htons(port);
97 memcpy(&saddr.sin_addr, h->h_addr_list[0], h->h_length);
98
99 if ((err =
100 connect(fd, (struct sockaddr *) &saddr,
101 sizeof(struct sockaddr_in))) != 0) {
102 close(fd);
103 return SANE_STATUS_INVAL;
104 }
105
106 *fdp = fd;
107
108 return SANE_STATUS_GOOD;
109 }
110
111 void
sanei_tcp_close(int fd)112 sanei_tcp_close(int fd)
113 {
114 close(fd);
115 #ifdef HAVE_WINSOCK2_H
116 WSACleanup();
117 #endif
118 }
119
120 ssize_t
sanei_tcp_write(int fd,const u_char * buf,size_t count)121 sanei_tcp_write(int fd, const u_char * buf, size_t count)
122 {
123 return send(fd, buf, count, 0);
124 }
125
126 ssize_t
sanei_tcp_read(int fd,u_char * buf,size_t count)127 sanei_tcp_read(int fd, u_char * buf, size_t count)
128 {
129 size_t bytes_recv = 0;
130 ssize_t rc = 1;
131
132 if (count > SSIZE_MAX) {
133 errno = EINVAL;
134 return -1;
135 }
136
137 while (bytes_recv < count && rc > 0)
138 {
139 rc = recv(fd, buf+bytes_recv, count-bytes_recv, 0);
140 if (rc > 0)
141 bytes_recv += rc;
142
143 }
144 return bytes_recv;
145 }
146